Selection Theory of Dendritic Growth with Anisotropic Diffusion

Selection Theory of Dendritic Growth with Anisotropic Diffusion
复制标题

各向异性扩散枝晶生长的选择理论

DOI:
10.1155/2015/529036
复制
发表时间:
2015
影响因子:
1.5
通讯作者:
K. Kassner
K. Kassner
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
M. von Kurnatowski;K. Kassner

文献摘要

参考文献

相似文献

当晶体生长到它自己的过冷熔体中时,树枝状图案经常出现。在两相边界处释放的潜热通过某些传输机制被移除,并且通常可以通过简单的扩散模型来描述该问题。它的解析解是基于无毛细效应情况下的微扰展开。图案的长度尺度由各向异性表面张力决定,这提供了用于稳定枝晶的机制。在液晶的情况下,扩散也可以是各向异性的。在热传输效率较低的方向上生长更快(反向生长)。任何物理解决方案都应包含此功能。一个简单的空间重新缩放是用来减少体方程在2D的情况下,各向同性扩散。随后,生长模式的特征值问题的结果从界面条件。数值计算了特征值,解决了各向异性扩散枝晶生长的选择问题。预测了长度尺度,并对反转生长现象给出了定量描述。发现各向异性扩散不能起到各向异性表面张力的稳定作用。
Dendritic patterns frequently arise when a crystal grows into its own undercooled melt. Latent heat released at the two‐phase boundary is removed by some transport mechanism, and often the problem can be described by a simple diffusion model. Its analytic solution is based on a perturbation expansion about the case without capillary effects. The length scale of the pattern is determined by anisotropic surface tension, which provides the mechanism for stabilizing the dendrite. In the case of liquid crystals, diffusion can be anisotropic too. Growth is faster in the direction of less efficient heat transport (inverted growth). Any physical solution should include this feature. A simple spatial rescaling is used to reduce the bulk equation in 2D to the case of isotropic diffusion. Subsequently, an eigenvalue problem for the growth mode results from the interface conditions. The eigenvalue is calculated numerically and the selection problem of dendritic growth with anisotropic diffusion is solved. The length scale is predicted and a quantitative description of the inverted growth phenomenon is given. It is found that anisotropic diffusion cannot take the stabilizing role of anisotropic surface tension.
DOI: --
发表时间: 1978
期刊:
影响因子: --
作者:
F. Rondelez;W. Urbach;H. Hervet
通讯作者: H. Hervet
移动向列-各向同性界面的不稳定性。
DOI: --
发表时间: 1987
影响因子: 8.6
作者:
p wald PO;Bechhoefer;Libchaber
通讯作者: Libchaber
树突生长动力学和结构 I. 新戊酸
DOI: 10.1016/0022-0248(91)90914-q
发表时间: 1991
影响因子: 1.8
作者:
E. R. Rubinstein;M. Glicksman
通讯作者: M. Glicksman
强制 Oseen 流中自由枝晶生长的尺度定律
DOI: 10.1088/1751-8113/47/32/325202
发表时间: 2014
期刊: Journal of Physics A: Mathematical and Theoretical
影响因子: --
作者:
M. von Kurnatowski;K. Kassner
通讯作者: K. Kassner
二维单面模型中针状晶体的速度选择
DOI: --
发表时间: 1987
期刊:
影响因子: --
作者:
C. Misbah
通讯作者: C. Misbah